The secret column - it is on the "Where Have I Been" page next to the DATE column. That little blank one.
I put this in after talking to one of my product design discussion group members. A group of my wonderful friends who took the time to comment on my developing design for the flight log.
Three Ways to use the Secret Column
The first way to use this column is to reference your flights to the "My Notes" page to provide you with notes for each journey. This is how we have been using it - see the photos below.